Abstract: In order to solve the problems of poor permeability in outburst coal seam, small gas flow of drilling extraction in original coal seam and long pre-pumping time in Huainan Coal Mine, we carried out a study of hydraulic fracturing and permeability improvement technology. The experiment was carried out in 1351 （3） working face, and the effect of hydraulic fracturing was investigated. Experiments show that hydraulic fracturing and permeability improvement technology can expand the pores and cracks in the coal seam, increase the permeability of coal seam, and the hydraulic fracturing radius is not less than 60 meters; compared with the original coal area affected by hydraulic fracturing, the single-hole extraction rate increased by 260%, and the net amount per unit area increased by 45%, the drilling volume reduced by 40%.